fix: Node objects should not be subject to namespace label checks

[fengxsong]

What type of PR is this?

bugfix

What this PR does / why we need it:

corev1.Node objects in Kubernetes are cluster-level resources that don't have a namespace, then r.hasMatchingNamespaceLabels function will always return false, nil.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.15%. Comparing base (b58edd7) to head (3d1db4b).
Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6565      +/-   ##
==========================================
+ Coverage   71.12%   71.15%   +0.03%     
==========================================
  Files         220      220              
  Lines       37971    37967       -4     
==========================================
+ Hits        27005    27015      +10     
+ Misses       9393     9381      -12     
+ Partials     1573     1571       -2     

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[arkodg]

LGTM thanks